PVC CNC Machining
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About HDPE for CNC Machining
Ultrahigh molecular weight polyethylene, or UHMW polyethylene, is a subset of high-density polyethylene (HDPE) that has some additional advantages. The material’s extremely long chain polymer helps improve its overall toughness. Its coefficient of friction is comparable to that of teflon, but it has better wear resistance. CNC machining of UHMW polyethylene is similar to machining other engineering plastics.
UHMW polyethylene is an advanced engineering plastic, which has extraordinary toughness, chemical resistance and wear resistance, even more than steel.
UHMW-PE At a Glance
| Application | Liners for chutes, chain guide profiles, dock bumper linings |
| Advantages | Exceptional abrasion resistance, exceptional toughness, low friction coefficient |
| Disadvantages | Not suitable for high temperatures and high levels of creep |
| Lead Time | Lead time is generally a minimum of 3 days. However, this can increase depending on availability or if the parts are to be internationally manufactured. |
| Price | $$ |
| Tolerances | Machining tolerances of 0.010” (0.25 mm) are achievable. |
| Wall Thickness | A minimum wall thickness of 0.03” (0.8 mm) is achievable. This can vary depending on the ratio of wall thickness to planar dimension. |
| Max Part Size | The maximum size of the part is determined by the machines available and the complexity of the part. |
Generic UHMW-PE
UHMW machining produces tough and wear-resistant parts, making it ideal for applications exposed to impact loads and abrasive materials. Common applications include wear plates and seals. Due to its susceptibility to creep, UHMWPE is not suitable for parts under continuous stress.
General Acrylic Properties
| Tensile Strength, Yield (MPa) | Elongation at Break (%) | Hardness (Shore D) | Heat Deflection Temperature (°C) | Melting Point (°C) |
|---|---|---|---|---|
| 40 | 300 | 66 | 46.7 | 135 |
Finishes
As is the case with most plastics for machining, acetal parts can only accept a few types of surface finishes. Below are some options for improving the surface finish of CNC machined Delrin components.
As Machined: It is possible to create an excellent surface finish fresh from the CNC machine. Findtop manufacturers achieve this using sharp HSS (high-speed steel) cutting tools with appropriate high rake and relief angles.
Cost-saving Design Tips
As is the case with most plastics for machining, acetal parts can only accept a few types of surface finishes. Below are some options for improving the surface finish of CNC machined Delrin components.
As Machined: It is possible to create an excellent surface finish fresh from the CNC machine. Findtop manufacturers achieve this using sharp HSS (high-speed steel) cutting tools with appropriate high rake and relief angles.